JPS5916869Y2 - Electronic clock display lighting structure - Google Patents

Description

[Detailed description of the invention] The present invention relates to a structure for illuminating the display on the panel with a lamp in an electronic watch having a liquid crystal panel, etc.
This is intended to enable a lamp unit formed by fixing a lamp to a simple holding member to be attached to and detached from a watch body using a cassette method with a one-touch operation.

Lamp leads are soft and bendable, making them difficult to handle, so it was necessary to use materials to strengthen them, such as soldering them to a circuit board, welding them to a complicated metal lead plate, and screwing them to a watch body.

For this reason, the number of parts increases, the number of assembly steps increases, rationalization,
Due to automation, the number of after-sales service parts such as brakes and lamps increased and the unit prices increased, resulting in lower yields and higher costs, and there were defects in after-sales service that lowered the product value.

The present invention is intended to compensate for the above-mentioned deficiencies, and will be explained with reference to the drawings.

1 and 2 show a conventional embodiment, and FIGS. 3 to 6 show an embodiment of the present invention.

In FIG. 1, a circuit board 1 made of ceramic or printed circuit board material on which a MOS-IC1 crystal resonator, a trimmer capacitor, a chip capacitor, etc. are mounted is connected to a lamp 2.
After the soldering is fixed, it is fixed to the circuit case 3.

Next, after installing the panel frame 4, the reflector 5 and the panel 6 are assembled.
The clock body as shown in the figure was formed by incorporating the panel press F.

Therefore, when replacing the lamp for after-sales service,
It takes time and effort to re-solder a new lamp, and in order to save time, the entire circuit board with the lamp must be replaced, placing a large burden on the consumer.Furthermore, the reflector for the lamp light is required. Because of this, the lighting efficiency of the panel was low.

FIG. 2 shows that the circuit board 1 on which circuit elements are mounted in the same manner as above is fixed to the circuit case 3, and after the panel frame 4 is assembled on the circuit case 3, the reflector 5 and the panel 6 are assembled. The watch body as shown in the figure was formed by incorporating panel presses.

The lamp unit is constructed by welding and fixing the leads of the lamp 2 to lamp lead plates 8a and 8b, which are fixed to the lamp holding member 9 by fixing pins 10a and 10b. was fixed to a screw pin 12 fixed to the circuit board 1 with a screw 11 as a contact point, thereby configuring the illumination structure of the panel.

The lamp lead plate 8a has a terminal corresponding to 8b (not shown in the figure), and the lead of the lamp 2 is welded and fixed in the same way as 8b, and the lamp lead plate 8a is located on the side of the bulb of the lamp 2. reflects the lamp light.

According to this structure, the lamp unit can be freely attached and detached from the watch body, making it easier to handle the lamp, and making it easier to replace the lamp unit for after-sales service. However, the structure is complicated and the number of parts increases. It has disadvantages such as not being able to be used commonly, which increases costs.

The present invention is intended to compensate for the above-mentioned defects and to provide a very simple lamp unit structure, and one embodiment thereof is shown in FIGS. 3 to 6.

As shown in Fig. 3, a tape-shaped circuit board 1 on which a MOS-IC, a crystal resonator, a trimmer capacitor, a chip capacitor, etc. are mounted is stacked with an elastic conductive member 8 and fixed to a circuit case 3 by thermally caulking a dowel 3a. Next, the panel frame 4 is assembled on the circuit case 3, and the reflector plate 5. Panel 6
The watch body is constructed as shown in the figure by incorporating the panel pusher.

A lamp unit is placed in a space created by a recess 3b provided in the circuit case 3 and surrounding members.The lamp unit consists of a lamp 2 and a holding member 9 that holds it, as shown in FIG. 9 has a recess or hole 9a for positioning the lamp 2, and is equipped with an electrode member 9b on the surface for electrically and mechanically fixing the lamp 2. The terminals are fixed with solder to form a lamp unit as shown in the figure, and this is inserted into the above-mentioned space, and the tip 8a of the elastic conductive member 8 is pressed against the electrode member 9b by the spring force, and the lamp unit is connected to the lamp 2. Electrical continuity is established and the lamp holding member 9 is fixed by pressure contact.

Note that the other end 8b of the elastic conductive member 8 is connected to the electrode portion 1 of the circuit board 1.
A is fixed to the circuit block for electrical connection with the circuit block.

Further, a part of the panel presser plate is arranged on the lamp holding plate 9 so that the lamp unit does not come out.

As mentioned above, according to the present invention, the lamp unit can be made into a very simple structure, and lamp replacement can be done with a single touch using the cassette method, making it possible to significantly improve workability in terms of manufacturing and after-sales service. In addition, in the current market where lamp units are in large supply among after-sales service parts for digital watches, this product has the great advantage of being able to provide quick and low-cost service to consumers.

Furthermore, as shown in Fig. 4, the lamp unit is made by cutting the lamp holder plate 9 from the long raw material on which the lamp 2 is mounted in an automated process, which requires a reduction in the number of parts. It is also possible to improve performance and significantly reduce costs.

In particular, in the present invention, the tip 8a of the elastic conductive member 8 connected to the circuit board 1 is placed in the recess provided in the circuit case 3, and the end of the plate-shaped holding plate 9 to which the lamp is attached is placed in the recess of the circuit case. When inserted, the plate-shaped holding member is sandwiched between the recess peripheral wall and the elastic conductive member, and the plate-shaped holding member is thereby connected to the electrode of the plate-shaped holding member. Therefore, the lamp unit can be easily attached and detached, and the circuit Since the lamp holding plate is held in place by a recess formed in a sufficiently thick part such as a case, reliable fixing and positioning can be expected, and it has the advantage of reducing costs and improving quality due to ease of assembly. It is something that you have.

In addition, in order to improve the reflection efficiency of lamp light, the concave portion 9a of the lamp holding member 9 may be provided with a reflecting member 9C or a reflective surface treatment as shown in FIG. Reflective member 9 is installed on the opposite side of the installation of lamp 2.
By equipping it with d, it is possible to bring about even more effects.

Note that while the lamp is lit, a large amount of current is consumed and the current voltage decreases.

Particularly at low temperatures, the rate of chemical reactions inside the battery slows down, resulting in a large drop in voltage.

Under these circumstances, if a watch is equipped with a battery life warning display function or an alarm function, the battery voltage drop due to lamp lighting may cause the battery life warning detection circuit to operate and cause a false display. Furthermore, there is a defect that the oscillation circuit stops operating and the clock stops when the alarm buzzer sounds.

In order to prevent this, a lamp control circuit is provided that prevents the lamp from being lit in the above-mentioned state.

By mounting the switching transistor 10 for lamp control on the lamp holding member 9 of the present invention as shown in FIG. 7, it is possible to simplify the circuit mounting structure, simplify mounting and assembly, and reduce the number of man-hours. At the same time, MO
By separating the S-IC and the transistor,
The MO5-IC chip can be made in a small amount, which can greatly contribute to improving yield and reducing costs.

[Brief explanation of the drawing]

1 and 2 are partially assembled sectional views of a display illumination structure using lamp light of a conventional digital electronic watch. FIG. 3 is a partially assembled sectional view of a display illumination structure of a digital electronic watch showing an embodiment of the present invention. FIG. 4 is an assembled plan view showing the lamp unit of the present invention. FIGS. 5 and 6 are assembled sectional views showing the lamp unit of the present invention. FIG. 7 is an assembled plan view of a lamp unit showing an embodiment of the present invention. Names of main parts 1...Circuit board, 2...
...Lamp, 3...Circuit case, 4...
・Panel frame, 5...Reflector, 6...Panel, 7...Panel stamping, 8...Lamp lead board, 9... ...Lamp holding member, 10a
, 10 b...Fixing pin, 11...
Screw, 12...screw pin.

Claims (1)

[Scope of utility model registration request] A liquid crystal panel as a display is placed on the back side of the circuit board,
In the display lighting structure of an electronic watch in which a circuit case is arranged on the front side, the lamp is fixed to a plate-shaped holding plate on which electrodes are arranged while maintaining conductivity to form a lamp unit, and a recess is formed on the circuit board side of the circuit case. an elastic conductive member that is continuous with the circuit board is placed in the recess, and when the lamp unit is inserted into the recess,
The peripheral wall of the concave portion and the elastic conductive member are configured to sandwich an end portion of the plate-shaped holding plate on which the electrodes are arranged and establish electrical continuity, and the lamp is located near the liquid crystal panel. A display lighting structure for an electronic clock featuring: